source3/smbd/pipes.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Pipe SMB reply routines
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-1998
   6    Copyright (C) Paul Ashton  1997-1998.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22 /*
  23    This file handles reply_ calls on named pipes that the server
  24    makes to handle specific protocols
  25 */
  26
  27
  28 #include "includes.h"
  29
  30 #define PIPE            "\\PIPE\\"
  31 #define PIPELEN         strlen(PIPE)
  32
  33 extern struct pipe_id_info pipe_names[];
  34
  35 /****************************************************************************
  36   reply to an open and X on a named pipe
  37
  38   This code is basically stolen from reply_open_and_X with some
  39   wrinkles to handle pipes.
  40 ****************************************************************************/
  41 int reply_open_pipe_and_X(connection_struct *conn,
  42                           char *inbuf,char *outbuf,int length,int bufsize)
  43 {
  44         pstring fname;
  45         pstring pipe_name;
  46         uint16 vuid = SVAL(inbuf, smb_uid);
  47         smb_np_struct *p;
  48         int smb_ofun = SVAL(inbuf,smb_vwv8);
  49         int size=0,fmode=0,mtime=0,rmode=0;
  50         int i;
  51
  52         /* XXXX we need to handle passed times, sattr and flags */
  53         srvstr_pull_buf(inbuf, pipe_name, smb_buf(inbuf), sizeof(pipe_name), STR_TERMINATE);
  54
  55         /* If the name doesn't start \PIPE\ then this is directed */
  56         /* at a mailslot or something we really, really don't understand, */
  57         /* not just something we really don't understand. */
  58         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 )
  59                 return(ERROR_DOS(ERRSRV,ERRaccess));
  60
  61         DEBUG(4,("Opening pipe %s.\n", pipe_name));
  62
  63         /* See if it is one we want to handle. */
  64         for( i = 0; pipe_names[i].client_pipe ; i++ )
  65                 if( strequal(pipe_name,pipe_names[i].client_pipe) )
  66                         break;
  67
  68         if (pipe_names[i].client_pipe == NULL)
  69                 return(ERROR_BOTH(NT_STATUS_OBJECT_NAME_NOT_FOUND,ERRDOS,ERRbadpipe));
  70
  71         /* Strip \PIPE\ off the name. */
  72         pstrcpy(fname, pipe_name + PIPELEN);
  73
  74
  75 #if 0
  76         /*
  77          * Hack for NT printers... JRA.
  78          */
  79     if(should_fail_next_srvsvc_open(fname))
  80       return(ERROR(ERRSRV,ERRaccess));
  81 #endif
  82
  83         /* Known pipes arrive with DIR attribs. Remove it so a regular file */
  84         /* can be opened and add it in after the open. */
  85         DEBUG(3,("Known pipe %s opening.\n",fname));
  86         smb_ofun |= FILE_CREATE_IF_NOT_EXIST;
  87
  88         p = open_rpc_pipe_p(fname, conn, vuid);
  89         if (!p) return(ERROR_DOS(ERRSRV,ERRnofids));
  90
  91         /* Prepare the reply */
  92         set_message(outbuf,15,0,True);
  93
  94         /* Mark the opened file as an existing named pipe in message mode. */
  95         SSVAL(outbuf,smb_vwv9,2);
  96         SSVAL(outbuf,smb_vwv10,0xc700);
  97
  98         if (rmode == 2) {
  99                 DEBUG(4,("Resetting open result to open from create.\n"));
 100                 rmode = 1;
 101         }
 102
 103         SSVAL(outbuf,smb_vwv2, p->pnum);
 104         SSVAL(outbuf,smb_vwv3,fmode);
 105         put_dos_date3(outbuf,smb_vwv4,mtime);
 106         SIVAL(outbuf,smb_vwv6,size);
 107         SSVAL(outbuf,smb_vwv8,rmode);
 108         SSVAL(outbuf,smb_vwv11,0x0001);
 109
 110         return chain_reply(inbuf,outbuf,length,bufsize);
 111 }
 112
 113 /****************************************************************************
 114   reply to a write on a pipe
 115 ****************************************************************************/
 116 int reply_pipe_write(char *inbuf,char *outbuf,int length,int dum_bufsize)
 117 {
 118         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
 119         size_t numtowrite = SVAL(inbuf,smb_vwv1);
 120         int nwritten;
 121         int outsize;
 122         char *data;
 123
 124         if (!p)
 125                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 126
 127         data = smb_buf(inbuf) + 3;
 128
 129         if (numtowrite == 0)
 130                 nwritten = 0;
 131         else
 132                 nwritten = write_to_pipe(p, data, numtowrite);
 133
 134         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
 135                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 136
 137         outsize = set_message(outbuf,1,0,True);
 138
 139         SSVAL(outbuf,smb_vwv0,nwritten);
 140
 141         DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n",
 142                  p->pnum, nwritten));
 143
 144         return(outsize);
 145 }
 146
 147 /****************************************************************************
 148  Reply to a write and X.
 149
 150  This code is basically stolen from reply_write_and_X with some
 151  wrinkles to handle pipes.
 152 ****************************************************************************/
 153
 154 int reply_pipe_write_and_X(char *inbuf,char *outbuf,int length,int bufsize)
 155 {
 156         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
 157         size_t numtowrite = SVAL(inbuf,smb_vwv10);
 158         int nwritten = -1;
 159         int smb_doff = SVAL(inbuf, smb_vwv11);
 160         BOOL pipe_start_message_raw = ((SVAL(inbuf, smb_vwv7) & (PIPE_START_MESSAGE|PIPE_RAW_MODE)) ==
 161                                                                         (PIPE_START_MESSAGE|PIPE_RAW_MODE));
 162         char *data;
 163
 164         if (!p)
 165                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 166
 167         data = smb_base(inbuf) + smb_doff;
 168
 169         if (numtowrite == 0)
 170                 nwritten = 0;
 171         else {
 172                 if(pipe_start_message_raw) {
 173                         /*
 174                          * For the start of a message in named pipe byte mode,
 175                          * the first two bytes are a length-of-pdu field. Ignore
 176                          * them (we don't trust the client. JRA.
 177                          */
 178                 if(numtowrite < 2) {
 179                                 DEBUG(0,("reply_pipe_write_and_X: start of message set and not enough data sent.(%u)\n",
 180                                         (unsigned int)numtowrite ));
 181                                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 182                         }
 183
 184                         data += 2;
 185                         numtowrite -= 2;
 186         }
 187                 nwritten = write_to_pipe(p, data, numtowrite);
 188         }
 189
 190         if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0))
 191                 return (UNIXERROR(ERRDOS,ERRnoaccess));
 192
 193         set_message(outbuf,6,0,True);
 194
 195         nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
 196         SSVAL(outbuf,smb_vwv2,nwritten);
 197
 198         DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n",
 199                  p->pnum, nwritten));
 200
 201         return chain_reply(inbuf,outbuf,length,bufsize);
 202 }
 203
 204 /****************************************************************************
 205   reply to a read and X
 206
 207   This code is basically stolen from reply_read_and_X with some
 208   wrinkles to handle pipes.
 209 ****************************************************************************/
 210 int reply_pipe_read_and_X(char *inbuf,char *outbuf,int length,int bufsize)
 211 {
 212         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv2);
 213         int smb_maxcnt = SVAL(inbuf,smb_vwv5);
 214         int smb_mincnt = SVAL(inbuf,smb_vwv6);
 215         int nread = -1;
 216         char *data;
 217         BOOL unused;
 218
 219         /* we don't use the offset given to use for pipe reads. This
 220            is deliberate, instead we always return the next lump of
 221            data on the pipe */
 222 #if 0
 223         uint32 smb_offs = IVAL(inbuf,smb_vwv3);
 224 #endif
 225
 226         if (!p)
 227                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 228
 229         set_message(outbuf,12,0,True);
 230         data = smb_buf(outbuf);
 231
 232         nread = read_from_pipe(p, data, smb_maxcnt, &unused);
 233
 234         if (nread < 0)
 235                 return(UNIXERROR(ERRDOS,ERRnoaccess));
 236
 237         SSVAL(outbuf,smb_vwv5,nread);
 238         SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
 239         SSVAL(smb_buf(outbuf),-2,nread);
 240
 241         DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
 242                  p->pnum, smb_mincnt, smb_maxcnt, nread));
 243
 244         return chain_reply(inbuf,outbuf,length,bufsize);
 245 }
 246
 247 /****************************************************************************
 248   reply to a close
 249 ****************************************************************************/
 250 int reply_pipe_close(connection_struct *conn, char *inbuf,char *outbuf)
 251 {
 252         smb_np_struct *p = get_rpc_pipe_p(inbuf,smb_vwv0);
 253         int outsize = set_message(outbuf,0,0,True);
 254
 255         if (!p)
 256                 return(ERROR_DOS(ERRDOS,ERRbadfid));
 257
 258         DEBUG(5,("reply_pipe_close: pnum:%x\n", p->pnum));
 259
 260         if (!close_rpc_pipe_hnd(p))
 261                 return ERROR_DOS(ERRDOS,ERRbadfid);
 262
 263         return(outsize);
 264 }